Principle of Reflexive Interpretation
A reflexive X must be bound in the minimal domain containing X, X's governor and an accessible subject/SUBJECT.
A A-binds B if and only if
(i) A is in an A-position
(ii) A c-commands B
(iii) A and B are coindexed
a. Subject: NP in [Spec,XP]
b. SUBJECT corresponds to finite AGR
A is an accessible subject/SUBJECT for B if the coindexation of A and B does not violate any grammatical principles.