“…These data have shown that the orientation of the applied magnetic field with respect to its rhombohedral crystal axes plays an important role in optimizing FOM values in Bi,,-,,Sb, alloys. In fact the behavior of the thermopower in a transverse magnetic field for Bi (Gruneisen 1936) and B4,,Sbx (Wove 1963) is very Werent, dependent on the relative orientation of magnetic field and crystallographic axes and is closely related to the crystal symmetry and band structure of these materials. However, little has been published to rationalize physically this fact in terms of a microscopic picture.…”