This job aid describes the process for submitting your resignation letter. State the Position You're Resigning From With An Effective Date.This sample resignation letter is available for use on UpCounsel. Thank you for your service with Dallas ISD. Per Dallas ISD Policy, all exiting employees are required to submit an official Notice of Separation (S54 Form). In this article, we share tips for writing a short, simple resignation letter and offer examples for you to reference when creating your own. A Resignation Letter is typically a formal document given to employers two weeks before an employee resigns from a role. Share this document. A Resignation Letter is typically a formal document given to employers two weeks before an employee resigns from a role. Share this document.