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We report quantitative analysis of positive magnetoresistance (PMR) forunidirectional-lateral-superlattice samples with relatively small periods(a=92-184 nm) and modulation amplitudes (V_0=0.015-0.25 meV). By comparingobserved PMR's with ones calculated using experimentally obtained mobilities,quantum mobilities, and V_0's, it is shown that contribution from streamingorbits (SO) accounts for only small fraction of the total PMR. For small V_0,the limiting magnetic field B_e of SO can be identified as an inflection pointof the magnetoresistance trace. The major part of PMR is ascribed to driftvelocity arising from incompleted cyclotron orbits obstructed by scatterings.Comment: 12 pages, 9 figures, REVTe

Origin of positive magnetoresistance in small-amplitude unidirectional lateral superlattices