Effect of hexamethylenetetramine on surface smoothness of electroplated copper coatingXiang Jing, Sheng Wenjing, Li Jie, Zeng Chong, Xu Yonggang, Yang Wenyao and Wang JingjieE3S Web Conf., 267 (2021) 02066DOI: https://doi.org/10.1051/e3sconf/202126702066