Unified weak-field magnetoresistance phenomenology for cubic and noncubic (001)- and (111)-oriented epitaxial films and surface layers

Extensions of the Seitz-Pearson-Suhl weak-field magnetoresistance (WFMR) formula are applied to cubic and noncubic (001) - and (111) -oriented epitaxial films and surface layers, including the extreme case of two-dimensional conductivity in a quantized layer. It is shown that four distinct WFMR measurements may be made on samples in either plane, thus providing a simple and reliable means of distinguishing cubic from noncubic transport environments.