A.R.S. § 10-3807: Resignation of directors

A. A director may resign at any time by delivering written notice to the board of directors, its presiding officer or the corporation.

B. A resignation is effective when the notice is delivered unless the notice specifies a later effective date or event. If a resignation is made effective at a later date, the board may fill the pending vacancy before the effective date if the board provides that the successor does not take office until the effective date.