Sheet-metal layer made of a high-temperature-corrosion-resistant steel for a metallic honeycomb body, containing chrome and aluminum fractions in particular, having a longitudinal direction and a top side and a bottom side and a thickness (d) of 0.015 to 0.1 mm, preferably 0.02 to 0.06 mm, wherein the sheet-metal layer comprises discontinuous microstructures (4, 5) extending in the longitudinal direction or at an acute angle to the longitudinal direction, and has the following features: a. the microstructures (4, 5) have a structure height, a structure length measured on the outside at half the structure height, and a structure width measured on the outside at half the structure height, and among each other a spacing, measured at half the structure height, with respect to the nearest microstructure (4,5) aligned approximately in the longitudinal direction thereof, said spacing being formed by interruptions, and a lateral spacing, measured between the structure centers, with respect to the nearest laterally adjacent microstructure (4, 5); b. the microstructures (4, 5) are designed so that some of the microstructures project out of the sheet-metal layer toward the top side and some of the microstructures project out of the sheet-metal layer toward the bottom side; wherein the sheet-metal layer is characterized by the following features: c. the microstructures (4, 5) are spaced, arranged, and designed in such a way that each straight theoretical line extending across the sheet-metal layer perpendicularly to the longitudinal direction intersects at least two microstructures (4, 5) projecting toward the top side and two microstructures projecting toward the bottom side; wherein d. the following relations apply: - the structure height is 0.02 to 0.1 mm, preferably 0.06 to 0.08 mm, - the structure length is 2 to 10 mm, preferably 4 to 6 mm, - the structure width is 0.2 to 1 mm, preferably approximately 0.5 mm, - the longitudinal spacing with respect to the nearest microstructure aligned approximately in the longitudinal direction thereof is greater than 2 mm, preferably 4 to 8 mm, - the lateral spacing with respect to the nearest laterally adjacent microstructure (4, 5) is 1 to 10 mm, preferably 2 to 6 mm. a. the microstructures (4, 5) have a structure height, a structure length measured on the outside at half the structure height, and a structure width measured on the outside at half the structure height, and among each other a spacing, measured at half the structure height, with respect to the nearest microstructure (4,5) aligned approximately in the longitudinal direction thereof, said spacing being formed by interruptions, and a lateral spacing, measured between the structure centers, with respect to the nearest laterally adjacent microstructure (4, 5); b. the microstructures (4, 5) are designed so that some of the microstructures project out of the sheet-metal layer toward the top side and some of the microstructures project out of the sheet-metal layer toward the bottom side; wherein the sheet-metal layer is characterized by the following features: c. the microstructures (4, 5) are spaced, arranged, and designed in such a way that each straight theoretical line extending across the sheet-metal layer perpendicularly to the longitudinal direction intersects at least two microstructures (4, 5) projecting toward the top side and two microstructures projecting toward the bottom side; wherein d. the following relations apply: - the structure height is 0.02 to 0.1 mm, preferably 0.06 to 0.08 mm, - the structure length is 2 to 10 mm, preferably 4 to 6 mm, - the structure width is 0.2 to 1 mm, preferably approximately 0.5 mm, - the longitudinal spacing with respect to the nearest microstructure aligned approximately in the longitudinal direction thereof is greater than 2 mm, preferably 4 to 8 mm, - the lateral spacing with respect to the nearest laterally adjacent microstructure (4, 5) is 1 to 10 mm, preferably 2 to 6 mm. - the structure height is 0.02 to 0.1 mm, preferably 0.06 to 0.08 mm, - the structure length is 2 to 10 mm, preferably 4 to 6 mm, - the structure width is 0.2 to 1 mm, preferably approximately 0.5 mm, - the longitudinal spacing with respect to the nearest microstructure aligned approximately in the longitudinal direction thereof is greater than 2 mm, preferably 4 to 8 mm, - the lateral spacing with respect to the nearest laterally adjacent microstructure (4, 5) is 1 to 10 mm, preferably 2 to 6 mm.