In the present invention, a BARC stack comprising at least a first BARC layer and at least a second BARC layer is optimized for reducing substrate reflectivity in lithographic processing applications. The present invention is devised so that if a first storage device is updated by writing data into this first storage device, the update data relating to the updating of the first storage device is written into a second storage device. The radio-frequency shielding structure may be formed from a printed circuit that includes a ground plane such as a flex circuit or rigid printed circuit board that includes at least one blanket layer of metal.