  We consider the effects of spacetime curvature and brane thickness on the
localization of gauge fields on a brane via kinetic terms induced by localized
fermions. We find that in a warped geometry with and infinitely thin brane,
both the infrared and the ultraviolet behavior of the electromagnetic
propagator are affected, providing a more stringent bound on the brane's
tension than that coming from the requirement of four-dimensional gravity on
the brane. On the other hand, for a thick wall in a flat spacetime, where the
fermions are localized by means of a Yukawa coupling, we find that
4-dimensional electromagnetism is recovered in a region bounded from above by
the same critical distance appearing in the thin case, but also from below by a
new scale related to the brane's thickness and the electromagnetic couplings.
