ATUS-X ethnic origin

Is there a variable for country of origin in the ATUS-X? In other words, can I add country of origin variable (if it exists) from CPS to ATUS?
Are there any known published works utilizing the ATUS-X specifically for different ethnic group studies?

The birthplace variable (BPL) is likely your best bet for identifying “country of origin” in the ATUS data. Other potential variables, are listed under the “core demographic” category.