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. 2017 May 19;7:2160. doi: 10.1038/s41598-017-02113-4

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© The Author(s) 2017

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IR spectra. Incident infrared intensity (red line) and beam transmitted through a Si(001) substrate (black line) and a 50 nm STO/Si(001) film grown at 360 °C (blue line). Inset: Absorbance of 50 nm STO/Si(001) film calculated using the Si(001) substrate signal as the reference (a).