  We note that orbifold boundary conditions that produce chiral fermion zero
modes in compactified higher dimensional theories may distort scalar field
vacuum expectation values, giving rise to nontrivial dependence on the extra
dimensions. We illustrate this in a simple five dimensional model which has
chiral fermion zero-modes stuck to fat branes. The model could provide a simple
and explicit realization of the separation of quarks and leptons in the fifth
dimension. We discuss the KK expansion in some detail. We find that there are
in general non-zero-mode states stuck to the brane, like the chiral zero modes.
We see explicitly the transition from states dominated by the internal
structure of the fat brane to those dominated by the compactification.
