Fri Jul 5, 2013 4:31pm EDT
* EU's Rehn says possible to split 8.1 bln euro tranche
* Euro zone finance ministers to tackle issue on Monday
* Greece offers plan to resolve public sector reform hurdle
By Terhi Kinnunen and George Georgiopoulos
MIKKELI, Finland/ATHENS, July 5 (Reuters) - Greece could get its next tranche of international aid in instalments, the EU's top economic official ...