We develop a symmetry-based low-energy theory for monolayer \mathrm{WTe}_2 W T e 2 in its 1T ^{\prime} ′ phase, which includes eight bands (four orbitals, two spins). This modelreduces to the conventional four-band spin-degenerate Dirac model nearthe Dirac points of the material. We show that measurements of the spinsusceptibility, and of the magnitude and time dependence of theanomalous Hall conductivity induced by injected or equilibrium spinpolarization can be used to determine the magnitude and form of thespin-orbit coupling Hamiltonian, as well as the dimensionless tilt ofthe Dirac bands.
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