Panel A): experimental interference curve obtained during the deposition of gaseous CO on a Si cold substrate using an He-Ne laser. Panel B): theoretical interference curve for solid CO film on a Si cold substrate. The comparison between the theoretical and experimental curves allows us to measure the sample thickness using the interference fringe method. Panel C): theoretical interference curves calculated assuming an ice with refractive index equal to 1.26 that is deposited on cold Au substrate for different laser wavelengths. For comparison, the interference curve computed for the same ice deposited on silicon is shown.