Learn how to write a professional two weeks notice letter with our easytouse template. Below is a sample union resignation letter.You should check your union's constitution and bylaws to see if it is specific to whom a resignation must be sent. I will go over a step-by-step resignation template letter you can use, how to structure it and provide examples of resignation letters. The complete guide to writing your resignation letter including expert tips, free copyable samples, and templates. Your resignation letter provides the board with formal notice of your departure. Clearly state the intent to resign in the opening paragraph. Use straightforward language to announce the resignation. A simple resignation letter format includes a resignation statement, an appropriate notice period, and an expression of gratitude. A written resignation is a formal notice to your department and the University that you are ending your employment relationship with the University.