Babaei, R.; Goli‑Haghighi, S.; Savaloni, H. Detection of Overtone and Combined Peaks Using Mn Cu Helical Star-Shaped (pine-Tree-Like) Sculptured Thin Films in Surface-Enhanced Raman Spectroscopy. J Theor Appl phys 2023, 13 (4). https://doi.org/10.1007/s40094-019-00348-2.