If this archive contains a specific dataset or toolset you are working with, a deep dive would require examining: : Is it for z/OS, Regina, or ooREXX?

Because this is a specific file archive rather than a broad academic concept, a "deep paper" on it would focus on its role in modern enterprise computing. The Evolution of REXX in Modern Systems

: Its strongest feature; it can slice strings without complex regex. Rexx_2020-10_to_12.zip

💡 : REXX is dynamically typed and uses a unique "instruction-based" syntax that differs from C-style languages.