Weak-field magnetoresistance symmetry in epitaxial films and bulk crystals of p -type SnTe

Nishiyama’s weak-field magnetoresistance measurements on p-type SnTe films deviate substantially from the requirements of cubic symmetry. A simple extension of the cubic theory to the case of substrate-induced tetragonal distortion can account for the measurements. To establish internal consistency of the data with tetragonal symmetry requires an additional measurement which was not, but can easily be, made.