Spatial map displaying the integrated spectral weight of the NbS 2 -terminated (term.) surface state as shown in Fig. 1e ( T = 21 K, h ν = 79 eV, LV polarization, colour scaling as in Fig. 1e ) but from a different cleave of the sample. The inset shows the observation of different domains where the splitting of the α band is found at positive (orange regions) or negative (purple regions) sides of our measured momentum. To generate this inset, MDCs at the Fermi level were fit from the underlying dispersions, with the ‘Δ valley splitting’ determined as the difference of the extracted Δ k F of the α 1 and α 2 bands between the two momentum sides.
