Correlative piezoresponse and micro-Raman imaging of CuInP2S6–In4/3P2S6 flakes unravels phase-specific phononic fingerprint via unsupervised learning. - Checa, M.; Ivanov, I.; Neumayer, S. M.; Susner, M. A.; McGuire, M. A.; Maksymovych, P.; Collins, L. (Applied Physics Letters, 2022)