A resignation letter provides notice that you will leave a company. Use one of our resignation letter templates.The complete guide to writing your resignation letter including expert tips, free copyable samples, and templates. Start with a two weeks notice letter. This will serve as a formal, written documentation of your intent to leave and your transition timeline. I would like to inform you that I am resigning from my position as a key data operator for the Turner Agency, effective August 15. A two weeks' notice letter of resignation is a professional courtesy and at times a contractual obligation. Here's how to let your boss know you're leaving.