Response to “Comment on ‘Phase reference in phase-sensitive sum-frequency vibrational spectroscopy”’ [J. Chem. Phys. 145, 167101 (2016)] - Sun, Shumei; Liang, Rongda; Xu, Xiaofan; Zhu, Heyuan; Shen, Y. Ron; Tian, Chuanshan (The Journal of chemical physics, 2016)