  Hints on the possible localization of fermions on double thick D-branes
(Domain Walls) are found by analyzing the moduli space of parameters. Deeper
analysis toward this direction might help to select phenomenologically
plausible models. A new kind of condition for fermion localization is proposed.
This might be useful in multi-brane-world scenarios, which are important when
symmetry breaking is considered in the AdS/CFT formalism, as well as in curved
brane-worlds.
