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If measurements over a range of film thicknesses are not possible, often measurements over a range of angles of incidence can be used to determine values for film thickness and refractive index. The method works best on a single thick transparent film, but it can be tried on thinner films and bilayers.
These applets, like others from the same author,do not appear to be written for general consumption but rather for students taking the course for which the applets were designed. Furthermore, the applets don't seem to offer anything that a good textbook cannot.