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A letter of resignation is written to announce the author's intent to leave whatever position he currently holds. It is usually addressed to his immediate supervisor and delivered at least two weeks in advance and contains such information as his intended last day at work. For courtesy's sake letters of resignation will thank the employer for the pleasure of working under him and the opportunities and experience gained thereby, and also offer to assist with the transition by, for example, training the replacement.
A notable exception to these conventions is then-President of the United States Richard Nixon's letter of resignation. Delivered to then-Secretary of State Henry Kissinger on 9 August 1974, it read simply, "I hereby resign the Office of President of the United States."
Richard Nixon's Resignation Letter to his Secretary of State, August 9, 1974