Electron‐diffraction investigation of single crystals of &ggr;‐poly (vinylidene fluoride) grown from the melt has revealed streaking of 0k0 reflections. The three‐dimensional structure of the spikes was studied by specimen tilting during electron diffraction; streaking is maximized in theb*c* view and disappears in thea*b* view, indicating that the reciprocal‐lattice spikes are directed parallel toc. After exclusion of effects associated with the shape transform of our &ggr; crystals, the streaks are attributed to stacking faults parallel to theabplane; such faults are consistent with incorporation of &agr; sequences as defects within &ggr; chains during crystallization. Conformational changes between &agr; and &ggr; arrangements are examined using a number of models. The simplest motions (flip‐flops or rigid crankshafts) require simultaneous rotation about two noncolinear axes and are, therefore, less favored than mechanisms involving flexible chain motions as described in this report.