Dependences of PSD Δϕ, ΔΦ, relations Δϕ/ΔΦ, Δϕ/ΔΦ^∼ and energy transmission coefficients T_1,2 of waves 1, 2 on the main layer thickness d₂ (a, b), parameters (c, d) for a ENZ material of layers 1, 3 and anisotropic materials of the main layer. The values of parameters are: ε₁ = ε₃ = 0.01 + 0.01i (a, b); (c, d); d₂ = 39 nm (c, d). The values of parameters for all the graphs are: ; ; d_1,3 = 250 nm; λ = 0.63 μm; ε_α,β = 1; ψ = 0. Figures b and d detail the data in Figures a and c, respectively. The black horizontal dashed line in Figures b, d characterizes equality to 1 of the corresponding quantities. TM polarization of the incident wave is used.