An axial EPR spectrum has been observed for the holes that result when Nb is substituted for Mo in Mo${\mathrm{S}}_2$. From the values of the $g$ tensor it is determined that the holes are in a $d_{z^2}$ band into which the spin-orbit interaction admixes some $d_{\mathrm{xz}}$ and $d_{\mathrm{yz}}$ orbitals. The EPR results are discussed in terms of the various energy-band structures that have been proposed for Mo${\mathrm{S}}_2$. The data are found to be consistent with the band structure suggested by Wilson and Yoffe.

• Received 12 January 1972

DOI:https://doi.org/10.1103/PhysRevLett.28.808