Dependences of angle θ (a, f), PSD of the reflected waves (b, d, g, i) and corresponding energy reflection coefficients (c, e, h, k) on parameter for various PCMs (amorphous and crystalline GST 225, VO₂) as the main layer material. The values of parameters are: d₂ = 5 nm (a–e), 50 nm (f–k). The values of parameters for all the graphs are: ψ = 0, λ = 650 nm, d_1,3,4 = 0, , μ_β = 1. d, e, i, k detail the corresponding graphs for the cases of optimal parameters. The black horizontal dashed line in (b) corresponds to the condition Δϕ = 0. Parameter is used as the abscissa axis for all the graphs.