Positive magnetoresistance of composite fermion systems with a weak one-dimensional density modulation

Adopting the mean-field composite fermion picture, we describe the magnetot ransport properties around filling factor v = 1/2 of a two-dimensional elec tron gas with a weak one-dimensional density modulation, The occurrence of a strong positive magnetoresistance at low effective magnetic fields as wel l as Weiss oscillations, which were observed in recent experiments in such systems, can be explained within a semiclassical Boltzmann equation approac h, provided one goes beyond a second order approximation in the modulation strength.