A stem formed by a taddhita-affix having an indicatory ka , has acute accent on the end syllable.,
Thus ना॒॒डा॒॒य॒॒नः꣡ formed by फक् 4.1.99, so also चा॒॒रा॒॒य॒॒णः꣡ ॥ Similarly आक्षि॒॒कः꣡, शा॒॒लाकि॒॒कः꣡ formed by ठक् 4.4.1.,
कितः
Adhyāya 6 · Pāda 1 · Rule 165