The procedures to be followed are implicit in the treatment given in Sect. 2.2. The parameters emerging are (for waveguides supporting zeroth and first order TM and TE modes) dA, no, ne and one other (e.g. nC); if the adlayer is isotropic a single refractive index nA suffices. Examples of an isotropic adlayer constituted from small spheroidal proteins is given by Guemouri et al. (1998); and of a continuous anistropic layer by Ramsden (1999) and Ramsden et al. (1995).
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