What is the touch AC of an attended object?
Larry the Lizard Wizard casts darkness and tries to touch his opponent's armor. darkness has a range of "touch" and targets an "object touched". Larry's medium sized opponent's touch AC is 14. What is his opponent's armor's touch AC? If Larry were instead to try to touch his medium sized opponent's one-handed weapon (which is a small object) would it have a different touch AC than his opponent's armor?
The "touch" range for spells says only that
Touch: You must touch a creature or object to affect it...
The combat rules specify how spells with a range of touch work in combat.
Touch Spells in Combat: Many spells have a range of touch. To use these spells, you cast the spell and then touch the subject. In the same round that you cast the spell, you may also touch (or attempt to touch) as a free action. You may take your move before casting the spell, after touching the target, or between casting the spell and touching the target. You can automatically touch one friend or use the spell on yourself, but to touch an opponent, you must succeed on an attack roll.
Touch Attacks: Touching an opponent with a touch spell is considered to be an armed attack and therefore does not provoke attacks of opportunity. The act of casting a spell, however, does provoke an attack of opportunity. Touch attacks come in two types: melee touch attacks and ranged touch attacks. You can score critical hits with either type of attack as long as the spell deals damage. Your opponent's AC against a touch attack does not include any armor bonus, shield bonus, or natural armor bonus. His size modifier, Dexterity modifier, and deflection bonus (if any) all apply normally.