Below you'll find a sample resignation letter informing the employer that the employee is resigning due to a new job opportunity. How to write a resignation letter that's effective immediately?Use an attractive header with your personal contact info, include the recipient's name, company and address, and include the date. I will go over a step-by-step resignation template letter you can use, how to structure it and provide examples of resignation letters. Remember to leave the company on good terms, starting with a 2 week notice letter. We've got you covered, from tips to samples. I am writing to formally notify you of my resignation from my position at PQR.