Magnetoresistance due to enhanced electron-electron interactions in amorphousCa70(Mg,Al)30

We report measurements of the temperature and magnetic field dependence of the resistivity of ${\mathrm{Ca}}_{70}$ ${\mathrm{Mg}}_{15}$ ${\mathrm{Al}}_{15}$ and ${\mathrm{Ca}}_{70}$ ${\mathrm{Al}}_{30}$ amorphous alloys, in temperatures down to 0.18 K and fields up to 6 T. The values of B/T are such that we enter a regime where enhanced electron-electron interactions become at least as important as weak localization. Analysis of the data shows that current theories continue to be applicable in those very weak spin-orbit scattering systems, even when B/T is as high as 23 T ${\mathrm{K}}^{\mathrm{-}1}$..AE