Optical contrast and refractive index of natural van der Waals heterostructure nanosheets of franckeite by Patricia Gant, Foad Ghasemi, David Maeso, Carmen Munuera, Elena López-Elvira, Riccardo Frisenda, David Pérez De Lara, Gabino Rubio-Bollinger, Mar Garcia-Hernandez, Andres Castellanos-Gomez

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