  We study the magnetotransport properties of high mobility holes in monolayer
and bilayer WSe$_2$, which display well defined Shubnikov-de Haas (SdH)
oscillations, and quantum Hall states (QHSs) in high magnetic fields. In both
mono and bilayer WSe$_2$, the SdH oscillations and the QHSs occur predominantly
at even filling factors, evincing a two-fold Landau level degeneracy. The
Fourier transform analysis of the SdH oscillations in bilayer WSe$_2$ reveal
the presence of two subbands localized in the top or the bottom layer, as well
as negative compressibility. From the temperature dependence of the SdH
oscillations we determine a hole effective mass of $0.45m_{0}$ for both mono
and bilayer WSe$_2$.
