1 mic recording.

[Seeker]

If it were me, I'd start about 12 - 18 inches away from the guitar, capsule at the same height of the guitar facing straight on pointed at the 12th fret. Depending on the guitar / sound you're looking for, you may want to move the mic slightly more toward the body of the guitar.

I've used this technique quite a bit with small diaphragm condenser mics when recording acoustic guitar that was intended to fit into a larger mix. If its a solo thing you may want to try a large diaphragm condenser or ribbon.

 

[rainy-taxi]

To me it also depends on what kind of sound you are after. How much "direct" sound do you want, do you want more or less bass in the sound? A spot which I found interesting is having the mic close to the player's right ear (assuming it is a right handed guitar) but the sound has less attack as you don't pick up the direct strings, only indirect.