Clifford stepped down from his role effective January 2 to pursue other opportunities, according to a university release.
The Nittany Lions are 0-2 as underdogs this season.
The Penn State Alumni Association will host an official tour package for alumni and friends who are traveling to the national semifinals at the Orange Bowl, set for 7:30 p.m., Thursday, Jan. 9.
The game featured 14 lead changes and 11 ties.
The Nittany Lions most recently beat the Fighting Irish 31-10 in the first full Beaver Stadium White Out.
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