弹性波在自由界面散射的左普里兹方程，实现了自由界面散射反射波和透射波系数随入射角度的变化关系图，并包含求解瑞雷面波方程-Elastic wave scattering in the free interface, the left Prydz equation to achieve a free interface, the reflected wave and transmission wave scattering coefficients with the changes in incident angle diagram, and includes solving Rayleigh surface wave equation