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  1. Graphene layers placed on SrTiO 3 single-crystal substrates, i.e., templates for remote epitaxy of functional oxide membranes, were investigated using temperature-dependent confocal Raman spectroscopy. This approach successfully resolved distinct Raman modes of graphene that are often untraceable in conventional measurements with non-confocal optics due to the strong Raman scattering background of SrTiO 3 . Information on defects and strain states was obtained for a few graphene/SrTiO 3 samples that were synthesized by different techniques. This confocal Raman spectroscopic approach can shed light on the investigation of not only this graphene/SrTiO 3 system but also various two-dimensional layered materials whose Raman modes interfere with their substrates. 
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