NOVELTY - The method of electroplating a film onto a conductive surface of a continuously moving roll-to-roll sheet, comprises continuously moving the roll-to-roll sheet through an electroplating unit, continuously electroplating the film onto using the electroplating unit, and detecting a thickness of the film electroplated onto a portion of the roll-to-roll sheet and generating a corresponding thickness signal. The continuous portions of the conductive surface are positioned for electroplating when disposed in the electroplating unit.    USE - Useful for electroplating a film onto a conductive surface of a continuously moving roll-to-roll sheet.    ADVANTAGE - The method provides deposition or growth of layers that are capable of forming a thin film solar cell in a roll-to-roll or in-line process attractive for higher throughput, lower cost and better yield.    DETAILED DESCRIPTION - The method of electroplating a film onto a conductive surface of a continuously moving roll-to-roll sheet, comprises continuously moving the roll-to-roll sheet through an electroplating unit, continuously electroplating the film onto using the electroplating unit, and detecting a thickness of the film electroplated onto a portion of the roll-to-roll sheet and generating a corresponding thickness signal. The continuous portions of the conductive surface are positioned for electroplating when disposed in the electroplating unit. The step of continuously electroplating includes the step of adjusting the thickness of the film toward a predetermined thickness value using the thickness signal for a portion of the roll-to-roll sheet that follows the portion of the roll-to-roll sheet. The step of detecting is performed using X-ray fluorescence. The steps of detecting and adjusting are repeated so that the thickness of the film is kept at the predetermined thickness value on the whole of the roll-to-roll sheet. The step of adjusting alters a deposition current density and an effective electroplating used by the electroplating unit based upon the thickness signal, and adjusting the thickness of the subsequent portion of the film. The step of detecting detects the thickness of the film at locations across a width of the continuously moving roll-to-roll sheet and the thickness is adjusted with respect to the location of the detecting. The corresponding thickness signals each control a current density and an effective electroplating length of corresponding anodes for the step of adjusting. Continuously electroplating another film at another deposition current density onto the film using another electroplating unit disposed adjacent to the electroplating unit as the roll-to-roll sheet moves through the another electroplating unit. INDEPENDENT CLAIMS are included for:    (1) a method of electroplating a stacked layer of films in sequentially disposed electroplating units onto a continuously moving roll-to-roll sheet;    (2) a method of controlling an electroplating of different films in a sequentially disposed electroplating units onto a top surface of a continuously moving roll-to-roll sheet; and    (3) a method of controlling electroplating of films onto a continuously moving roll-to-roll sheet using sequentially disposed electroplating units.    DESCRIPTION OF DRAWING(S) - The figure shows a roll-to-roll electrodeposition system:    Base; (100)    Copper processing unit; (130)    Gallium processing unit; (140)    Copper metrology station; (160)    Indium metrology station. (180)