  A quasiclassical theory for dc magnetotransport in a modulated quantum Hall
system near filling factor $\nu={1/2}$ is presented. A weak one-dimensional
electrostatic potential acts on the two-dimensional electron gas. Closed form
analytic expressions are obtained for the resistivity $\rho_\perp$
corresponding to a current at right angles to the direction of the modulation
lines as well as a smaller component $\rho_{||}$ for a current along the
direction of the modulation lines. It is shown that both resistivity components
are affected by the presence of the modulation. Numerical results are presented
for $\rho_\perp$ and $\rho_{||}$ and show reasonable agreement with the results
of recent experiments.
