In the standard Higgs model of electroweak symmetry breaking, the Higg
s boson is associated with both vector-boson and fermion mass generati
on. In contrast, we discuss a two-Higgs-doublet model in which these m
asses are associated with two different scalar bosons. We show that th
e Higgs boson associated with vector-boson mass generation produces a
characteristic peak-dip structure in the cross section for ttBAR-->ZZ
via a final-state interaction.