Fig. 14.

$⟨z_{max}\mid t⟩$ (blue solid line), $⟨\overline{z}\mid t⟩$ (blue dashed line), and ratio $⟨z_{max}\mid t⟩/⟨\overline{z}\mid t⟩$ (red line) as a function of ρ for a two-layer medium ( $s_1=15\text{mm}$ , $s_2=75\text{mm}$ , $n_1=n_2=1.4$ ). (a) different absorption ( ${\mu }_{a1}=0.005\text{m}{\text{m}}^{-1}$ , ${\mu }_{a2}=0.015\text{m}{\text{m}}^{-1}$ ), same scattering ( ${\mu }_{s1}^{\mathrm{\prime }}={\mu }_{s2}^{\mathrm{\prime }}=1.0\text{m}{\text{m}}^{-1}$ ); (b) different absorption ( ${\mu }_{a1}=0.015\text{m}{\text{m}}^{-1}$ , ${\mu }_{a2}=0.005\text{m}{\text{m}}^{-1}$ ), same scattering ( ${\mu }_{s1}^{\mathrm{\prime }}={\mu }_{s2}^{\mathrm{\prime }}=1.0\text{m}{\text{m}}^{-1}$ ); (c) same absorption ( ${\mu }_{a1}={\mu }_{a2}=0.015\text{m}{\text{m}}^{-1}$ ), different scattering ( ${\mu }_{s1}^{\mathrm{\prime }}=0.5\text{m}{\text{m}}^{-1}$ , ${\mu }_{s2}^{\mathrm{\prime }}=1.0\text{m}{\text{m}}^{-1}$ ); (d) same absorption ( ${\mu }_{a1}={\mu }_{a2}=0.015\text{m}{\text{m}}^{-1}$ ), different scattering ( ${\mu }_{s1}^{\mathrm{\prime }}=1.0\text{m}{\text{m}}^{-1}$ , ${\mu }_{s2}^{\mathrm{\prime }}=0.5\text{m}{\text{m}}^{-1}$ ). In all cases $n_{e1}=n_{e2}=1.0$ .