  We add to our knowledge of the approximate fixed point property (AFPP) in
digital topology. We show that a digital image that is a tree has the AFPP.
Given two digital images (X, \kappa) and (Y, \lambda) that have the approximate
fixed point property, does their Cartesian product have the AFPP? We explore
conditions that yield an affirmative answer. A general answer to this question
is not known at the current writing.
