A resignation letter must state a teacher's intent to retire on a positive note with an offer to cooperate during the transition process. Org or call 412-529-4537.This article will address how to write a retirement letter of resignation and provide an example that you can use as a template for your own retirement letter. All of the following forms must be completed and returned to the Retirement Office for your application to be processed. Application Forms (must be completed). Use a retirement resignation letter template to inform your employer that you plan to leave the workforce. In the opening paragraph, make it clear that you are retiring. If you are an active, contributing member of PSERS who terminates all Pennsylvania public school employment, a benefit is likely available to you.