Internal Structure and Temporal Stability of Hard X-ray Pd/B 4 C Multilayer Mirrors under Different Humidity Environments. - Liu, Genchang; Huang, Qiushi; Qi, Runze; Ni, Hangjian; Feng, Yufei; Zhang, Zhong; Wang, Zhanshan (Coatings (2079-6412), 2021)