ORA-00600: internal error code, arguments: [skkxerrp], [skkxdllload],
[SlfFopen], [/u001/CRP1/oracle/crp1db10g/10.2.0/plsql/nativelib/d66/STANDARD__SYS__S__647.so], [No such file or directory], , , 
A search of metalink will result in a single hit, NOTE:382767.1. The note mentions two possible solutions:
- Setup native PL/SQL before cloning
- Modify the rapid clone template file to remove two plsql parameters.
When I looked at the template file ($ORACLE_HOME/appsutil/template/afinitdb_102.ora), I noticed that by default the parameter plsql_code_type gets reset to INTERPRETED. I'm not sure why this happens, I would have assumed it would be set to the production value of NATIVE. So instead of performing the solutions described in the metalink note I change plsql_code_type to native and re-executed adcfgclone.pl dbTier, which this time completed without error.