Raman signal reveals the rhombohedral crystallographic structure in ultra-thin layers of bismuth thermally evaporated on amorphous substrate

CS and JMvR acknowledge financial support from research programme of the Foundation for Fundamental Research on Matter (FOM), which is supported by the Netherlands Organization for Scientific Research (NWO). Also, CS and AC gratefully acknowledges financial support offered by Generalitat Valenciana through PROMETEO2017/139, PROMETEO2019/016 and GENT (CDEIGENT2018/028). We thank the Ministry of Finances and Competitiveness for its financial support through the grants RTI2018-093711-B-I00 and MAT2016-82015-REDT as well as FPI programme for young researchers.