Mich. Comp. Laws § 31.5
All state executive officers, within 30 days after taking office, taking into consideration the safety factor to be gained by geographical dispersion of appointments, shall designate by title 5 emergency interim successors and specify their order of succession. The state executive officers shall file a list of the emergency interim successors, together with their order of succession, with the secretary of state. The state executive officers shall review and, as necessary, revise the designation of emergency interim successors to insure that at all times there are 5 qualified emergency interim successors. A state executive officer shall keep his emergency interim successors generally informed as to the duties, procedures, practices and current affairs of his office.
MCL 31.5