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A new class of small-amplitude magnetoresistance oscillation has been unveiled in unidirectional lateral superlattice (ULSL) samples in a low magnetic field regime dominated by positive magnetoresistance. The oscillation is ascribed to geometric resonance of Bragg-reflected cyclotron orbits. The predicted approximate $\propto$$a^{-3}$$k_\mathrm{F}^{-1}$ dependence of the positions of maxima, where $a$ and $k_\mathrm{F}$ represent the period and the Fermi wavenumber, respectively, has been confirmed by comparing ULSL samples with $a$=184 and 207 nm.

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