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(a, c) Raman spectra obtained from the out-of-plane WS2 and in the in-plane MoS2 cross sections, respectively. A Gaussian fit of the E12g and A1g peaks is also displayed. (b, d) Comparison between the Raman spectra of the out-of-plane WS2 and the in-plane MoS2 cross sections with the ones obtained from the corresponding bulk vertical WS2 specimen.
