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We present initial Raman spectroscopy experiments on exfoliated flakes of$\alpha$-RuCl$_3$, from tens of nm thick down to single layers. Besidesunexpectedly finding this material to be air stable, in the thinnest layers weobserve the appearance with decreasing temperature of a symmetry-forbidden modein crossed polarization, along with an anomalous broadening of a mode at 164cm$^{-1}$ that is known to couple to a continuum of magnetic excitations. Thismay be due to an enhancement of magnetic fluctuations and evidence for adistorted honeycomb lattice in single- and bi-layer samples.

Possible Structural Transformation and Enhanced Magnetic Fluctuations in Exfoliated $\alpha$-RuCl$_3$