['Films', 'of', 'the', 'SoC', 'were', 'prepared', 'by', 'spin', 'coating', 'on', 'hydrogen', '-', 'terminated', 'silicon', 'substrates', 'with', 'a', 'speed', 'varying', 'between', '800', 'and', '2000', 'RPM', 'for', '60s', '.']