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The authors did not mention this method for discussions in the manuscript. The RPWBA method in the manuscript should be compared with the previous rDWBA theory. At least the authors should mention the differences of the two methods and how far the RPWBA can be compared to rDWBA? In earlier publications [Physics Reports 315 (1999) 409 and related references], a fully relativistic distorted-wave Born approximation (rDWBA) has been developed to describe the relativistic ionization processes.