  We consider the effects of adding a fourth generation to a model with two
compactified extra dimensions -- one warped and the other flat. The extra
dimensions lead to towers of Kaluza-Klein (KK) Z bosons. Interestingly, the
higher KK-Z modes depending on the flat dimension contribute more than the
warped dimension.
  These KK-Z modes enhance the cross-section of fourth generation charged
leptons . The most promising signature is the heavy charged lepton decaying to
a heavy neutrino and W boson.
