We substituted the measured values of the amplitude d and the half-wavelength w, as obtained from Figure 6d, into Equation (3), and then calculated the SCS formation angle 2α. The fold angle θ was calculated from Equation (4). Figure 7b presents the relationship between θ and L. Based on a linear approximation of the plot in Figure 7b, θ and L are defined from the fold coefficient m by the following equation: