A multilayer radar-absorbing laminate suitable for use on aircraft made of composite material with polymeric matrix containing graphene nanoplatelets, where the laminate comprises a plurality of juxtaposed blocks, with - a first electrically conductive block to be placed in use toward the inside of the aircraft, having an electromagnetic radiation reflection coefficient greater than -1 dB; - a second intermediate electromagnetic absorber block, comprising a stack of electrically non-conductive fiber sheets, where each fiber sheet is at least partially permeated with graphene-based nanoplatelets, so as to achieve a periodic and electromagnetically subresonant layer in which conductive layers containing graphene nanoplatelets alternate with non-conductive layers; - a third block of electrically non-conductive material to be arranged toward the outside in use and forming part of the outer surface of the aircraft; where the second block is obtainable by a process that comprises the steps of: a) providing graphene nanoplatelets with a thickness between 2 nm and 100 nm and lateral dimensions between 100 nm and 10 μm; b) dispersion of graphene nanoplatelets in a diluted polymeric mixture consisting of a solvent and a polymer, so as to obtain a suspension of graphene nanoplatelets in a polymeric mixture; c) deposition by air spraying of said suspension on one or both opposite sides of said non-conductive dry fiber sheets, with controlled penetration of the nanoplatelets into the respective fiber sheets; d) formation of the second block by overlapping a plurality of dry fiber sheets sprayed with the suspension of graphene nanoplatelets; and where the step of forming the second block is followed by the steps of: e) execution of a lay-up including the first, second and third blocks; f) infusion of unpolymerized thermosetting synthetic resin into the lay-up thus obtained; g) application of heat and, if necessary, pressure so as to cause the polymerization of the thermosetting resin and the homogeneous and uniform distribution of the nanoplatelets within a thickness portion of the fiber sheets comprising the second intermediate block. - a first electrically conductive block to be placed in use toward the inside of the aircraft, having an electromagnetic radiation reflection coefficient greater than -1 dB; - a second intermediate electromagnetic absorber block, comprising a stack of electrically non-conductive fiber sheets, where each fiber sheet is at least partially permeated with graphene-based nanoplatelets, so as to achieve a periodic and electromagnetically subresonant layer in which conductive layers containing graphene nanoplatelets alternate with non-conductive layers; - a third block of electrically non-conductive material to be arranged toward the outside in use and forming part of the outer surface of the aircraft; a) providing graphene nanoplatelets with a thickness between 2 nm and 100 nm and lateral dimensions between 100 nm and 10 μm; b) dispersion of graphene nanoplatelets in a diluted polymeric mixture consisting of a solvent and a polymer, so as to obtain a suspension of graphene nanoplatelets in a polymeric mixture; c) deposition by air spraying of said suspension on one or both opposite sides of said non-conductive dry fiber sheets, with controlled penetration of the nanoplatelets into the respective fiber sheets; d) formation of the second block by overlapping a plurality of dry fiber sheets sprayed with the suspension of graphene nanoplatelets; e) execution of a lay-up including the first, second and third blocks; f) infusion of unpolymerized thermosetting synthetic resin into the lay-up thus obtained; g) application of heat and, if necessary, pressure so as to cause the polymerization of the thermosetting resin and the homogeneous and uniform distribution of the nanoplatelets within a thickness portion of the fiber sheets comprising the second intermediate block.