Need clarification on the 'Defiant' armor bonus

[Silh]

Recently, I upgraded the armor and shield of one of my characters and gave them the 'defiant' armor bonus. But I am a little confused on how part of the bonus works. Assume that both armor and shield are 'defiant' against the same type of creature.

Armor and shields with this special ability excel at blocking the attacks of certain types of creatures, similar to a bane weapon's excelling against certain foes. Against the designated foe, the item's enhancement bonus to AC is +2 better than its actual bonus and provides DR 2/— against attacks from that foe. This increase in enhancement bonus applies only to the armor or shield's enhancement bonus, not to temporary bonuses (such as the magic vestment spell). To randomly determine the armor or shield's designated foe, use the table for the bane weapon special ability (page 136).

The way this bonus is described makes me think that the DR would stack if you have two different sources in this case. Can someone provide a link to a developer who might say otherwise? If the DR portion does not stack, shouldn't that be mentioned?

Also, because this bonus specifically states 'against attacks' without specifying, I am going to assume that the DR applies to all attacks from said type of enemy (Melee, ranged, ranged-touch, etc.)

If anyone can provide links to an official ruling I'd appreciate it. Thanks!

[Bbauzh ap Aghauzh]

I would say the DR does not stack unless it specifically says that it does.

[Kintrik]

For the stacking that is covered by the stacking rules. DRs don't stack, but you can have 2 different kinds, which must then both be bypassed to get through.

edit: Everything about stacking and DR is in the CRB. I don't have it on me to give you page numbers though.

[Seraphimpunk]

when you have 2 DRs, you use the better.

ie. if you have DR 2/chaotic, and DR 2/adamantine
you don't knock off 4 damage from a plain longsword, you just knock off 2.
think of it as getting DR 2/ chaotic and admantine.

if one of your DRs is better vs the incoming attack, you apply that.
so if you had DR 5/admantine , and DR 2/chaotic, you'd use the adamantine against most attacks.

if you got hit by a devil weilding an adamantine weapon though, you'd be able to apply the Chaotic DR.