Spell resistance does not stack, but rather overlaps.
Spell Resistance on the PFSRD.
Does that mean that one overcomes the other (you only have one spell resistance even if both are equal, enemies only roll once)?
Or does that mean you have two "layers" of SR, meaning if an enemy beats one they still have to beat the other?
Currently debating in a game where someone will be gaining SR 15+Class Level from two classes (gestalt game)