Previously, the annealing of PS thin films above the glass transition temperature of the bulk PS polymer has been shown to affect the thermal, optical, and mechanical properties, as annealing relaxes the stress . Therefore, since annealing is a common industrial technique utilized to strengthen and increase the degradation time of thin films, it is essential to determine the effect annealing has on the thickness of polystyrene thin films spin coated through our standardized procedure so that the manifold's prediction method has even greater industrial applicability.