A grain-oriented electrical steel comprising - a core layer which has a thickness of 50 μm to 220 μm and two outer surfaces, the core layer consisting of, in % by weight, Si: 1 to 8 %, S + Se: < 0.010%, and optionally in sum less than 3 % of at least one element of the group "C, Mn, Cu, Cr, Sn, Al, N, Ti, B" the remainder being Fe and unavoidable impurities, - interface layers one of which being present on each outer surface of the core layer, the interface layers being formed by reaction products of at least one of the alloying elements of the core layer, wherein the reaction products of at least one of the alloying elements of the core layer are mixed oxides of iron and silica, and - at least one outer layer present on each of the interface layers, the outer layers constituting an electrical insulation media and the sum of the thicknesses of the outer layers being at least 0.1 μm and less than 5 μm, wherein the thickness of the core layer is at least 25 times greater than the sum of the thicknesses of the outer layers and wherein the thicknesses t il of the interface layers respectively fulfil the following provision: t il < t ol / t core × ρ / μ 0 × μ dif × π × f 1 / 2 × 10 − 9 with t il being the thickness of the interface layer present in the respective surface of the core layer, indicated in nm, t ol being the thickness of the respective outer layer present on the respective interface layer, indicated in μm, t core being the thickness of the core layer, indicated in μm, p being the electrical resistivity of the core layer, indicated in Ω m, μ 0 being the magnetic constant 4 × π × 10 -7, μ dif being the differential permeability of the core layer, and f being the frequency of the respective current in the range of 400 Hz to 3000 Hz. - a core layer which has a thickness of 50 μm to 220 μm and two outer surfaces, the core layer consisting of, in % by weight, Si: 1 to 8 %, S + Se: < 0.010%, and optionally in sum less than 3 % of at least one element of the group "C, Mn, Cu, Cr, Sn, Al, N, Ti, B" the remainder being Fe and unavoidable impurities, Si: 1 to 8 %, S + Se: < 0.010%, and optionally in sum less than 3 % of at least one element of the group "C, Mn, Cu, Cr, Sn, Al, N, Ti, B" the remainder being Fe and unavoidable impurities, - interface layers one of which being present on each outer surface of the core layer, the interface layers being formed by reaction products of at least one of the alloying elements of the core layer, wherein the reaction products of at least one of the alloying elements of the core layer are mixed oxides of iron and silica, and - at least one outer layer present on each of the interface layers, the outer layers constituting an electrical insulation media and the sum of the thicknesses of the outer layers being at least 0.1 μm and less than 5 μm, wherein the thickness of the core layer is at least 25 times greater than the sum of the thicknesses of the outer layers and wherein the thicknesses t il of the interface layers respectively fulfil the following provision: t il < t ol / t core × ρ / μ 0 × μ dif × π × f 1 / 2 × 10 − 9 with wherein the thickness of the core layer is at least 25 times greater than the sum of the thicknesses of the outer layers and wherein the thicknesses t il of the interface layers respectively fulfil the following provision: t il < t ol / t core × ρ / μ 0 × μ dif × π × f 1 / 2 × 10 − 9 with t il being the thickness of the interface layer present in the respective surface of the core layer, indicated in nm, t ol being the thickness of the respective outer layer present on the respective interface layer, indicated in μm, t core being the thickness of the core layer, indicated in μm, p being the electrical resistivity of the core layer, indicated in Ω m, μ 0 being the magnetic constant 4 × π × 10 -7, μ dif being the differential permeability of the core layer, and f being the frequency of the respective current in the range of 400 Hz to 3000 Hz.