In exactly 5 positions, the letter immediately before Heavy Noon carries Fathah.
Emphatic formPosition
لَيَفْعَلَنَّmasculine Ghaa'ib singular
لَتَفْعَلَنَّfeminine Ghaa'ib singular
لَتَفْعَلَنَّmasculine Haadhir singular
لَأَفْعَلَنَّMutakallim singular
لَنَفْعَلَنَّMutakallim plural