Towards the realistic fermion masses with a single family in extra   dimensions
  In a class of multidimensional models, topology of a thick brane provides three chiral fermionic families with hierarchical masses and mixings in the effective four-dimensional theory, while the full model contains a single vector-like generation. We carry out numerical simulations and reproduce all known Standard Model fermion masses and mixings in one of these models. 
M. V. Libanov and E. Ya. Nougaev