[Koha] authors

Hello Is there another way to get additional authors into the basket , without this method <!-- TMPL_LOOP NAME="MARCAUTHORS" --> <!-- TMPL_LOOP NAME="MARCAUTHOR_SUBFIELDS_LOOP" --><TMPL_VAR NAME="separator" --><!-- TMPL_VAR NAME="value" --></a><!-- /TMPL_LOOP --> <!-- TMPL_UNLESS NAME="__last__" -->| <!-- /TMPL_UNLESS --> <!-- /TMPL_LOOP --> . I want to get a sub-field of the author only and do not want the other subfields I want to get the value in the sub-field (a) any help??