  We determine the interface tension of the finite-temperature electroweak
phase transition in a numerical investigation of the SU(2)--Higgs model on a
four-dimensional lattice with temporal extension $L_t=3$. In this simulation
the chosen parameters correspond to a Higgs boson mass of about 16 GeV. As a
result the interface tension shows only small scaling violations in comparison
with previous studies for $L_t=2$ lattices. We also report on some experiences
with autocorrelations in the applied Monte Carlo simulations of two-phase
systems.
