%0 Journal Article %T Envelopes of optical interference spectra for duplex and triplex layered structures %A Kosobutskyy P.S. %A Kushnir O.P. %J Ukrainian Journal of Physical Optics %D 2008 %I Institute of Physical Optics %X We have found analytical expressions for the envelopes of maxima and minima of interference reflection and transmission spectra for both transparent and absorbing two- and three-layer structures under the conditions of arbitrary light incidence and polarization state. General regularities for the shape of those spectral envelopes are established, depending on the optical thicknesses of constituent layers. %K reflection spectra envelopes %K thin film %K two- and three-layer structures %U http://www.ifo.lviv.ua/journal/2008/2008_2_9_01.html