  Ball and Carstensen theoretically investigated the possibility of the
occurrence of non-classical austenite-martensite interfaces and studied the
cubic-to-tetragonal case extensively. Here, we aim to present an analysis of
such interfaces recently observed by Seiner et al. in CuAlNi single crystals,
undergoing a cubic-to-orthorhombic transition. We show that they can be
described by the non-linear elasticity model for martensitic transformations
and we make some predictions regarding the volume fractions of the martensitic
variants involved, as well as the habit plane normals.
