Unified weak-field magnetoresistance phenomenology for (111)-oriented thin films and surface layers with cubic, trigonal, and hexagonal symmetries. II. The evolution towards two-dimensional conductivity

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Abstract
This is an addendum to an earlier paper which developed a four-parameter generalization of the Seitz-Pearson-Suhl formulation of weak-field magnetoresistance. That paper derived and discussed briefly the constraints imposed on those parameters in the case of two-dimensional (2D) conductivity. The present Brief Report enlarges that discussion, relating those parameters to several kinds of experimental observations, to the values of certain sample-oriented magnetoresistance tensor components, and to the behavior of a magnetoresistance calculation based on a specific band model. The evolution of these characteristics is described, as a series of constraints of increasing severity changes the nature of the conducting medium from the general case of trigonal symmetry to the limiting one of 2D conductivity.