Second harmonic generation (SHG) from Langmuir-Blodgett films of hemicyanine dye was measured in various optical geometries. It was found that the SH intensities show a great difference in two cases: a) when s-polarized light is incident upon the monolayer from the air side; and b) when it is incident from behind through the glass substrate. In contrast, the difference is negligible for p-polarized light. This fact is true in both transmission and reflection geometries.
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Kajikawa et al. (1990) studied this question.