Comment on ‘‘Infrared external reflection spectroscopy of adsorbates on dielectric substrates: Determining adsorbate orientation in Langmuir monolayers’’ [J. Chem. Phys. 98, 5825 (1993)]

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Abstract
In a reply to a recent paper by J. T. Buontempo and S. A. Rice [J. Chem. Phys. 98, 5825 (1993)], it is shown that incorrect expressions were used for the parallel and perpendicular components of the absorption indices k, which lead to erroneous intensities in the calculated infrared reflection spectra. Recalculation of the results with the correct equations shows that a molecular orientation analysis based on the dichroic intensity ratios, as proposed in that paper, generally does require a knowledge of the isotropic absorption coefficients.