This excerpt taken from the AFFX DEF 14A filed Apr 29, 2005.
This charter governs the operations of the Audit Committee. The committee shall review the charter and conduct a self-evaluation at least annually and communicate the results to the Nominating and Corporate Governance Committee. The Audit Committee shall consist of at least three members, comprised solely of independent directors meeting the independence and experience requirements of NASDAQ and the Sarbanes-Oxley Act. At least one member shall qualify as an "audit committee financial expert", as defined by the rules and regulations of the Securities and Exchange Commission ("SEC"), and shall possess the experience or background required by the rules and regulations of the NASDAQ. The Nominating and Corporate Governance Committee shall recommend nominees for appointment to the Audit Committee annually and as vacancies or newly created positions occur. Audit Committee members shall be appointed by the Board and may be removed by the Board at any time. The Nominating and Corporate Governance Committee shall recommend to the Board, and the Board shall designate, the Chair of the Audit Committee.