Abstract: A method of producing a flat, reinforced article with micro-openings is described wherein at least one reinforcing layer is applied to a basic layer. To be able to carry out such a method in an easy and inexpensive way, the following steps should be taken: Coating a prefabricated basic layer at both sides with a radiosensitive resist in such a way that the resist fills the micro-openings, irradiating the basic layer provided with the resist from one side in such a way that the radiation passes through the resist in the micro-openings, removing the resist from the basic-layer regions to be provided with the reinforcing layer, applying the reinforcing layer and subsequently removing the remaining resist.