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FTIR spectra acquired at and at of a thick sample processed at . TO and LO modes correspond to those reported in Table I.
FTIR spectra acquired at of 120, 90, 45, and thick samples processed at . , , and .
curves for 120, 45, and thick samples processed at . Inset: CET vs stack physical thickness plot acquired for samples thicker than and also processed at .
Infrared active TO and LO phonon mode frequencies and intensities for obtained theoretically from ab initio calculations and measured experimentally from the FTIR spectrum acquired at (Fig. 1).
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