Mixer for an engine, which mixer - has, for the mixing of fluid flows (f1, f2) from a primary flow channel and from a secondary flow channel of the engine, in each case multiple first and second guide elements (210, 220) which alternate along a circumferential direction and which extend along a central axis, wherein the first guide elements are, with at least one radially outwardly running section, of diffuser-like form and the second guide elements are, with at least one radially inwardly running section, of nozzle-like form, and - the mixer is composed of a composite material with at least two separate material layers (a1-a5, b1-b4, c1-c4, d1-d5; 20a-20g; 20aa-20dd), characterized in that the at least two material layers (a1-a5, b1-b4, c1-c4, d1-d5; 20a-20g; 20aa-20dd) are arranged with their margins overlapping one another along the central axis for the purposes of at least locally stiffening the structure of the mixer, specifically in a region (OL13, OL24, OL35, OL46, OL57, OL68; S1-S8) of the mixer in which the first and second guide elements (210, 220) are provided, wherein - two adjacent first and second guide elements (210, 220) have a common side wall which runs between a radially outermost section of the first guide element and a radially innermost section of the second guide element, and the at least two material layers (20aa-20dd) are, at this side wall, arranged so as to overlap one another along the central axis such that a local thickening (V1-V4) which extends in an axial direction and which locally stiffens the structure of the mixer is formed approximately centrally on the inherently flat side wall owing to the overlapping material layers (20aa-20dd), - marginal edges (201bb, 202bb), extending along the central axis, of the overlapping material layers (20aa-20dd) each have a course which, in relation to the central axis, comprises not only the one axial directional component but also both a directional component in a circumferential direction and a directional component in a radial direction (r), and - the marginal edges (201bb, 202bb) run in a curved manner with respect to at least two mutually perpendicular spatial axes. - has, for the mixing of fluid flows (f1, f2) from a primary flow channel and from a secondary flow channel of the engine, in each case multiple first and second guide elements (210, 220) which alternate along a circumferential direction and which extend along a central axis, wherein the first guide elements are, with at least one radially outwardly running section, of diffuser-like form and the second guide elements are, with at least one radially inwardly running section, of nozzle-like form, and - the mixer is composed of a composite material with at least two separate material layers (a1-a5, b1-b4, c1-c4, d1-d5; 20a-20g; 20aa-20dd), characterized in that the at least two material layers (a1-a5, b1-b4, c1-c4, d1-d5; 20a-20g; 20aa-20dd) are arranged with their margins overlapping one another along the central axis for the purposes of at least locally stiffening the structure of the mixer, specifically in a region (OL13, OL24, OL35, OL46, OL57, OL68; S1-S8) of the mixer in which the first and second guide elements (210, 220) are provided, wherein - two adjacent first and second guide elements (210, 220) have a common side wall which runs between a radially outermost section of the first guide element and a radially innermost section of the second guide element, and the at least two material layers (20aa-20dd) are, at this side wall, arranged so as to overlap one another along the central axis such that a local thickening (V1-V4) which extends in an axial direction and which locally stiffens the structure of the mixer is formed approximately centrally on the inherently flat side wall owing to the overlapping material layers (20aa-20dd), - marginal edges (201bb, 202bb), extending along the central axis, of the overlapping material layers (20aa-20dd) each have a course which, in relation to the central axis, comprises not only the one axial directional component but also both a directional component in a circumferential direction and a directional component in a radial direction (r), and - the marginal edges (201bb, 202bb) run in a curved manner with respect to at least two mutually perpendicular spatial axes.