Panning doubled guitar tracks

mmm... delicious can 'o' worms.
 
;-)
 
It really depends. I've been playing around with all sorts of combinations using similar setups.
 
The simplest for that scenario would be panning one of them to 100-90%, another to 70-60% and another (I'd say the riffs) 40-20%.
 
However maybe you want your chords on the left (or right) and the riffs opposite.
 
Or maybe you want your clean chords and dirty chords working as a unit (pan them closer to each other on one or both sides).
 
Or maybe you don't REALLY need doubles of everything and you can just bring the doubles in to reinforce certain parts where the guits are sounding thin or there are no vocals or you simply want things to build up and get more chaotic. In that scenario you have tons of source material to make it happen.
 
So it's more about deciding what effect you are going for. If you want all if it going at once on both sides but still have each part defined I'd go with the first option I mentioned and play around with where it all sits in the stereo field (making sure you pair things up opposite of each other or maybe switch the clean and distorted locations in the field).
 
I would also recommend looking into using different amp sounds/sims for the opposite partner or using "mirror" EQ. The former would just be using a complimentary amp sound (whether via sim or live input like a different amp or guitar) and the latter would be doing something like create precise EQ boosts and cuts that exactly opposite of it's partner track on the opposite side of the stereo field.
 
BUT... I am still experimenting with all this myself so take that with a grain of salt. It is however the type of thing I was questioning not so long ago and I've been getting some nice results using some of the principles listed above.
 
Every mix and song is different so remain flexible and experiment.
 
 
Cheers.

https://soundcloud.com/bats-brew/high-time
 
here's a good example of extreme and less extreme multitracked guitars.....
but acoustic.
LOL
 
still, it tells the story..
 
two of the rhythms, are hard panned.....
then two more, are panned at about 45% left and right...
then i have some solo guitars that are panned just left/right of center....
harmony vocals are double tracked, but not panned together....
 

One thing to also be aware of is that for some material you really don't want a double. Like a solo but in you example maybe the "riffs". It can muddy things up unnecessarily.
 
On your tracks in Sonar (and most DAWs) you will have the option to have the track output as mono or stereo (the Interleave button). Most guitar sims output in stereo as do effects like stereo delays and reverbs.
 
So for something like double tracks I've panned left and right using a stereo out amp sim (which spreads the signal to both sides via the internal mixer) I'll switch the track (in Sonar) to output mono when panning. This requires messing with the sim if it's a bi amp set up or dual cab setup or whatever because they may not sum the way you want.
 
Basically you are keeping the signal mono from the track and then summing at the BUS in Sonar using your double on the other side to create the stereo image instead.
 
For a riff or solo though I might use the stereo output from the sim because there is NO doubled track. Then I can take advantage of the stereo output or bi amp features of the sim without the potential "mushiness" or phasing that can occur with an ultra tight solo/riff played twice can cause.
 
So essentially you leave the track as Stereo Output Interleave and keep it more to the middle (but you can still pan the track or within the sim).
 
Other times maybe you really want to focus that solo or riff though so switching to Mono Interleave can point it more directly or sum any stereo effects in the sim. That might make it cut more/keep it out of the way of the other guits/instruments in the mix.
 
So... ya see, there's just tons of stuff to consider and watch out for. It took me a while to realize that sims were outputting stereo and how to manipulate them to blend two amps to mono in a way I liked.
 
Also something to consider in those scenarios is "Mid Side" processing where you can force the output from the amp sim (or whatever) to the edges of the left/right channels but turn it down in the center to allow things like vox/kick/snare/bass/etc to cut up the middle.
 
Point is... learn your sims (if you are using them) and figure out what they are outputting to each side. There are usually quite a few complex ways to manage the stereo output from them.
 
Hopefully that makes sense. This post was mostly free form rambling.
 
lol
 
Have fun.

Experiment and go with what sounds good. Something that makes you smile.

I will reinforce your idea of complimentary EQ'ing the double tracks.  It will give the impression of a wider mix.  You can also track the doubled parts with different guitar/effects/amp combinations to get a wider sounding mix, too.  Obviously this won't work for everything so you'll have to experiment a little.
 
And my apologies if some else mentioned this above, there were a lot TL;DR posts.

One additional trick is to invert the phasing between a left and right panned tracked. In your left panned track, you'd boost 1k frequency by some amount of db. In your right panned track you'd cut it the 1k frequency by some amount of db. Or just use Panipulator plugin. You get the idea with my Late Arrival song. (Listen through headphones ) at 0.35 the guitar (two panned guitar tracks) sounds like it's in the top half of your headphones, then at 0.41 the additionally tracked (two additional panned guitar tracks these tracks are using Panipulator) guitar sits lower in the headphones.