Professional resignation letter examples for different reasons. Free templates and writing guide to resign on a positive note without feeling awkward.A. An employee will notify his or her supervisor at least two weeks prior to the date he or she intends to separate from employment with the City. Learn how to write a professional resignation letter with our step-by-step guide, easy to use templates and helpful tips. In this article, we share tips for writing a short, simple resignation letter and offer examples for you to reference when creating your own.