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Dear Mr. Osborne,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a series titled Administrative and Operational Records, 1968 - 3/1973 of Advisory Team 42 in the Records of the U.S. Forces in Southeast Asia (Record Group 472) that includes the file unit titled 1603-03A PHOENIX Activity File, 1970. For access to and/or copies of this file unit, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org.
We hope this is helpful. Best of luck with your research!