A ray-tracing calculation that uses reflection and transmission coefficients for layers with refractive-index matched boundaries leads to the corresponding coefficients for refractive-index mismatch. The model is compared with Monte Carlo calculations for a range of layer parameters. The absorption by a mismatched layer is higher than the corresponding layer with matched boundaries and relatively insensitive to the extent of scattering anisotropy. The model should be useful for practical calculations on biological tissues where refractive-index mismatch is usually present.
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