Abstract
A spiral dislocation with axis perpendicular to the lattice planes of a layer lattice converts the disconnected sheets to a connected helicoid. Crystal properties dependent on propagation effects and so strongly anisotropic in the layered crystal may approach isotropicity as intra-plane parameters can now dominate inter-plane propagation. A single defect may thereby have a macroscopic effect on semiconduction and photoduction, magnetic susceptibility, specific heat, and other properties. Substances in which such effects may exist are listed.

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