Exit policy :
Stage 1 - employee informs the senior about his resignation. The senior needs to discuss the reason for leaving, any retention steps that can be used for the employee to withdraw his resignation.
Stage 2 - formal communication to HR and senior about resignation. Here, the employee should mention his last working date
Stage 3 - Senior needs to approve of the last working date. He should fist check by when the handover would be complete by the employee and approve accordingly.
Stage 4 - HR sends a list of formalities that are required to be completed by the employee before he leaves the company. it could be clearances from all depts - IT, Admin, HR, Accounts, Work related handovers, etc.
Stage 5 - HR issues a work experience certificate to employee stating that the date of joining and the last working date of the employee so that he can show the same as evidence to his next employer
Stage 6 - Papers are sent to Payroll / Accounts to process the Full and Final Settlement.
Hope this helps you - however, you need to first check with different departments as to what are their requirements which need to be complete before someone leaves the company.
Good luck !
cheers