  In the standard model with two Higgs doublets it is shown that the existence
of the electroweak Z-string in general requires the same characteristic length
for the two Higgs fields as well as a specific ratio of the two Higgs vacuum
expectation values, i.e. $\tan\beta$. This ratio can be determined in terms of
the couplings in the Higgs potential. Some remarks on the supersymmetric case
are given. \noindent (Talk presented at SUSY '93, March 29-April 1st,
Northeastern University, Boston, MA 02115, USA.)
