Supporting Information Tracking down the Origin of Peculiar Vibrational Spectra of Aromatic Self-assembled Thiolate Monolayers Laxman Kankate a,c , Thorben Hamann a , Shikun Li b , Lyudmila V. Moskaleva b , Armin Gölzhäuser c , Andrey Turchanin d , Petra Swiderek a a University of Bremen, Faculty 2 (Chemistry/Biology), Institute of Applied and Physical Chemistry, Leobener Straße 5 (NW2), Postfach 330440, 28334 Bremen, Germany b University of Bremen, Faculty 2 (Chemistry/Biology), Institute of Applied and Physical Chemistry, Leobener Straße 6 (UFT), Postfach 330440, 28334 Bremen, Germany c Department of Physics, Physics of Supramolecular Systems and Surfaces, University of Bielefeld, 33615 Bielefeld, Germany d Institute of Physical Chemistry, Friedrich Schiller University Jena, Lessingstr. 10, 07747 Jena, Germany Electronic Supplementary Material (ESI) for Physical Chemistry Chemical Physics. This journal is © the Owner Societies 2018