1 Atomic structure of Pd 81 Si 19 glassy alloy under high pressure H. B. Lou 1 , L. H. Xiong 1 , A. S. Ahmad 1 , A. G. Li 2 , K. Yang 2 , K. Glazyrin 3 , H. P. Liermann 3 , H. Franz 3 , X. D. Wang 1 , Q. P. Cao 1 , D. X. Zhang 4 , and J. Z. Jiang 1, * 1 International Center for New-Structured Materials and Laboratory of New-Structured Materials, State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P.R. China. 2 Shanghai Institute of Applied Physics, Chinese Academy of Sciences，Shanghai 201203, P. R. China. 3 Photon Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22603 Hamburg, Germany. 4 State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, 310027, P.R. China. *E-mail: jiangjz@zju.edu.cn