Use singlespacing throughout your resignation letter. Align all paragraphs to the left.Use one of our resignation letter templates. The complete guide to writing your resignation letter including expert tips, free copyable samples, and templates. This sample resignation letter is available for use on UpCounsel. Start with a two weeks notice letter. This will serve as a formal, written documentation of your intent to leave and your transition timeline. Resignation Letter Template with Free Sample Form. There are several components to a successful resignation letter. It is standard practice to give at least a two-week notice.