Fig 25. Variation of wall properties on ψ for H = 5, α = 1.5, k = 3.5, ϵ = 0.2, t = 0.0, β = 0.4 when (a): E₁ = 0.03, E₂ = 0.02, E₃ = 0.1 (b): E₁ = 0.04, E₂ = 0.02, E₃ = 0.1 (c): E₁ = 0.03, E₂ = 0.04, E₃ = 0.1 and (d): E₁ = 0.03, E₂ = 0.02, E₃ = 0.2.