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I've been looking at the Spell Resistance armor enchantment and the Spell Resistance ability, which describes as "Not stacks, but overlaps" and that got me to thinking about *how* that overlap works.
I did a search on the internet, AFTER coming to my own conclusion (which is the topic of this post) and found that, to my dismay, SR appears to be written as working similar to DR. Which is nice, except that SR is also described in the SRD as being like magic version of AC (which stacks), which DR is not at all.
The conclusions I made, based on the word 'overlap' which implies partial stacking (such as overlapping pieces of paper) and the SR item and armor enchants (which reads as being 10,000 gp per point over SR 12; SR 13 minimum, or 13 +2 bonus,15 +3, 17 +4, 19 +5, respectively)
And I came to this conclusion:
When given multiple sources of SR from armor or items, for each additional item beyond the first granting such spell resistance, subtract 12 and add onto the total.
Now, this is a very VERY basic concept, assuming that SR is minimum 12, and not taking into account innate spell resistances, and developed by someone who isn't intimately familiar with the rules. I'd love to start a discussion about whether or not this is overpowering characters who choose to have spell resistance, how to balance it out it if its, whether it should apply only to the armor/items or to all SR sources, etcetera.
(PS: Whoever moved this to the proper board: Thank you! I was having trouble navigating the forums, I'm a tad new to this.)