LAUSR

We observe strong spin-orbit interactions in a two-dimensional electron system formed on $\mathrm{SrTi}{\mathrm{O}}_{3}(001)$ films grown epitaxially on p-Si(001). High-resolution transmission electron microscopy and related analytical techniques reveal a sharp interface between Si and $\mathrm{SrTi}{\mathrm{O}}_{3}$. Strain mapping analysis shows in-plane strain in $\mathrm{SrTi}{\mathrm{O}}_{3}$ very close to the interface. Analysis of the low temperature magnetoconductance measurements reveals that both quantum interference and electron-electron interactions are important. The contributions of these two quantum phenomena to the temperature and magnetic field dependence of the conductance and Hall effect are separated. The electron system has carrier concentrations larger than ${10}^{14}\mathrm{c}{\mathrm{m}}^{\ensuremath{-}2}$, appears to be confined within \ensuremath{\sim}4 nm, and has an estimated spin-splitting energy \ensuremath{\sim}12 meV.