Dear Board Members: Please accept my resignation from the Miami-Dade County Public Schools for the following reason(s):. Administrative Leave. 01.Employees may complete this process on-line, in the SAP system, through the Employee. Portal or through Human Resources. I am requesting this resignation become effective which will be my last day of employment. Respectfully,. 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.