In the event of layoff, the order of layoff within the class shall be determined by the length of service based on District hire date. The employee who has been employed the shortest time in the District shall be laid off first. Reemployment shall be in the reverse order of layoff. “Length of service” shall not be interpreted to mean any service performed prior to entering into probationary or permanent status in the classified service of the district except service in restricted positions. (Note: Involuntary reduction in time is considered as layoff.) [Education Code 45308]. In the event of simultaneous layoffs in a class series, the layoff will occur first in the higher class, followed by displacement to the lower class. When displacements into the lower class have been completed, the layoff in the lower class will occur.