In Tuschel, 2015, the Figure , we can find the Raman spectra of a MoS2 flake, "taken at the same location with different excitation wavelengths". "Exfoliated few-layer flakes of MoS2 are typically heterogeneous, and so the Raman and photoluminescence spectra tend to spatially vary on the flake. Nevertheless, there are spectra that can be considered representative of few-layer MoS2 and they are shown in Figure . … The spectrum acquired with 532-nm excitation is typical of those reported in the literature" . In fact, we can see the E 1 2g and A1g bands and the Si substrate band at 520 cm -1 . "In contrast, the spectrum generated with 632.8-nm excitation is striking insofar as it consists of the same first-order bands and those due to harmonics and combination modes". The absorption spectrum of MoS2 is characterized by peaks at "1.9 eV (653 nm) and 2.1 eV (590 nm) related to d-to-d orbital transitions split by spin-orbit coupling and designated A1 and B1 excitons, respectively" (Tuschel, 2015, mentioning . Using the 632.8-nm excitation, it "couples into the A1 transition producing a resonance enhancement of all of the additional modes observed in Figure " (given by Tuschel). "All of the bands in the spectrum excited with 632.8-nm light can be accounted for and have previously been assigned (Tuschel and references therein). The article by , is proposing the spectra of microcrystalline powder and natural crystal samples.