Superconductivity and Localization in the Presence of Strong Spin-Orbit Scattering

We discuss the question of superconductivity and localization in systems with strong spin-orbit scattering. It is argued that most materials in three dimensions undergo superconductor-metal-insulator transitions with increasing disorder. In thin films, only superconductor-insulator transitions occur. In high-$T_c^{\prime }$ three-dimensional materials and thin films, it is possible to have insulating behavior at high temperature and superconducting behavior at low $T$.