Acknowledgements The authors acknowledge the support from the Polish National Centre for R&D under projects N R15 0018 06 and PBS1/A5/27/2012. Electronic supplementary material Additional file 1: Two-dimensional X-ray diffraction (XRD2) pattern of the crystalline 30-nm-thick Ag layer deposited at 295 K. The central bright spot comes from diffraction on Al2O3 single-crystal substrate and the weak arc from silver nanocrystallites with periodicity 3.88 Å and random orientation in space. (PNG 2 MB) Additional file 2: SEM image of the 10-nm Ag film on 1-nm Ge interlayer deposited
at RT on sapphire substrate. The 10-nm Ag film has the lowest, ever reported, surface AZD1390 research buy roughness of RMS = 0.22 nm and ten-point height equal to 1.05 nm. (PNG 854 KB) References 1. Halas NJ, Lal S, Chang W-S, Link S, Nordlander P: Plasmons in strongly coupled metallic nanostructures. Chem Rev 2011, 111:3913–3961.CrossRef 2. Mayy M, Zhu G, Mayy E, Webb A, Noginov MA: Low temperature studies of surface plasmon polaritons
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