Fermi-surface topology of $2H-\mathrm{T}\mathrm{a}{\mathrm{Se}}_2$ at 4.2 K

The magnetoresistance of single-crystal $2H-\mathrm{T}\mathrm{a}{\mathrm{Se}}_2$ in the commensurate charge-density-wave state has been measured at 4.2 K in magnetic fields up to 48 kG. The results indicate that the Fermi surface supports open orbits parallel to the [0001] direction for all orientations of magnetic field in the (0001) plane. No evidence of open orbits in other directions was observed.