Defense and ACFollow

When I examine another player I see his Defense rating but not his armor class. When I look at my own Persona I see AC but not Defense. I know that Defense is a skill that grows with use and level, but how do you calculate it? Is it AC + Defense or what? Thanks.

Hmm.... I must invistigate when I get home. Will post reply tomorrow if noone beats me to it.
Easy to check ingame though, ask someone to examine you and have them tell you what defence you have and compare to skill and ac.