The original idea in undertaking the study of the CsBi-GIC's was to perform a detailed examination of their superconductivity. Since, as described in the previous section, no superconductivity could be found, it was decided to pursue experiments on the normal state which would help to explain the lack of a transition. One place to look for clues about the lack of superconductivity is the materials' Fermi surface (FS), since only the electrons with energies near EF participate in superconductivity. Shubnikov-de Haas (SdH) measurements have in the past been useful in measuring the Fermi surface properties of metals in general[10] and GIC's in particular.[216,79] The SdH measurements performed here at MIT are complementary to optical,[270] magnetic resonance,[224] and zero-field transport[161] performed elsewhere.