  Thermal scaling and relaxation of the interface width in an electrophoretic
deposition of polymer chains is examined by a three-dimensional Monte Carlo
simulation on a discrete lattice. Variation of the equilibrium interface width
$W_r$ with the temperature $T$ shows deroughening $W_r \propto T^{-\delta}$,
with $\delta \sim 1/4$, at low temperatures and roughening $W_r \propto
T^{\nu}$, with $\nu \sim 0.4$ at high temperatures. The roughening-deroughening
transition temperature $T_t$ increases with longer chain lengths and is reduced
by using the slower segmental dynamics.
