An interconnector for a stack of SOEC/SOFC type solid oxide cells operating at high temperature, intended to be arranged between two adjacent electrochemical cells of the stack, each electrochemical cell being formed of a cathode, an anode and an electrolyte interposed between the cathode and the anode, characterised in that it comprises a planar face on which at least a first group of identical first relief elements with respect to the planar face and a second group of identical second relief elements with respect to the planar face are formed, the first relief elements having different geometric characteristics with respect to the second relief elements, the height of each first relief element, measured as the largest vertical dimension of the first relief element with respect to the planar face, being different from the height of each second relief element, measured as the largest vertical dimension of the second relief element, the contact width of each first relief element, measured as the largest horizontal dimension with respect to the planar face of the outer contact end of each first relief element, opposite the inner end in contact with the planar face and intended to be in contact with an electrochemical cell, being different from the contact width of each second relief element, measured as the largest horizontal dimension with respect to the planar face of the outer contact end of each second relief element, opposite the inner end in contact with the planar face and intended to be in contact with an electrochemical cell the interconnector comprising a metal alloy substrate having two main planar faces, one of the main planar faces comprising a first coating layer forming a first contact layer with an electrochemical cell, the other of the main planar faces comprising a second coating layer forming a second contact layer with an electrochemical cell, the first coating layer and/or the second coating layer comprising a planar face and relief elements (10a, 10b, 10c) formed thereon. the first relief elements having different geometric characteristics with respect to the second relief elements, the height of each first relief element, measured as the largest vertical dimension of the first relief element with respect to the planar face, being different from the height of each second relief element, measured as the largest vertical dimension of the second relief element, the contact width of each first relief element, measured as the largest horizontal dimension with respect to the planar face of the outer contact end of each first relief element, opposite the inner end in contact with the planar face and intended to be in contact with an electrochemical cell, being different from the contact width of each second relief element, measured as the largest horizontal dimension with respect to the planar face of the outer contact end of each second relief element, opposite the inner end in contact with the planar face and intended to be in contact with an electrochemical cell the interconnector comprising a metal alloy substrate having two main planar faces, one of the main planar faces comprising a first coating layer forming a first contact layer with an electrochemical cell, the other of the main planar faces comprising a second coating layer forming a second contact layer with an electrochemical cell, the first coating layer and/or the second coating layer comprising a planar face and relief elements (10a, 10b, 10c) formed thereon.