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We show via calculation and experiment that a recently observed angular magnetoresistance effect in low-dimensional conductors can be explained by ''effective electrons,'' which dominate the conductivity for magnetic-field orientations near inflection points on a warped Fermi surface. Closed orbits, which form in certain field orientations, play an insignificant role. In studies of the quasi-one-dimensional molecular metal ͑TMTSF͒ 2 PF 6 , we observe, in addition to sharp kink structure of the effect, a series of strong angular oscillations that we ascribe to the Lebed' commensurability resonance ͑magic angle͒ effect.

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