Guess Inc. co-founder and Chairman Paul Marciano is relinquishing his day-to-day responsibilities at the company following sexual harassment accusations by model Kate Upton and other women. Guess (NYSE: GES) said its board on Feb. 7 formed a special committee comprised of two independent directors to oversee an ongoing investigation into the allegations of improper conduct by Marciano. The Los Angeles-based fashion brand said Marciano will be placed on unpaid leave, pending the completion of the…