The purpose of the letter is to keep in your file to prove 1) you resigned and weren't fired. 2) You gave the proper notice.A two (2) weeks notice resignation letter is the most common letter used when notifying an employer of an official resignation. Add contact details, company name, and date. The PDF version of these forms are FILLABLE. They can be filled out electronically, then printed. Please accept my resignation from the firm effective immediately. Hafler, This letter serves as my letter of resignation from the. Augusta Township Board of Trustees. Acknowledgement: Theresa King resignation letter.