An input interface, comprising: a display; a window overlaid on the display, the window having an inner face facing toward the display and an outer face; a housing (10; 13-15) supporting the window; a first sensor arrangement (31, 32) configured to sense a position of a touch action on the window in two dimensions, the first sensor arrangement (31, 32) comprising a first plurality of conductive traces; and a second sensor arrangement (41-43; 41-49) configured to sense a magnitude of a force applied by the touch action onto the window, the second sensor arrangement (41-43; 41-49) comprising a second plurality of conductive traces (41, 42; 41, 42, 44, 45, 47, 48) and a force sensing material (43; 43, 46, 49), the force sensing material (43; 43, 46, 49) having a first face supported on a support area of the housing (10; 13-15), wherein the first plurality of conductive traces and the second plurality of conductive traces (41, 42; 41, 42, 44, 45, 47, 48) are positioned on the inner face of the window and attached to the inner face of the window, and wherein the force sensing material (43; 43, 46, 49) is attached to the inner face of the window such that the force sensing material (43; 43, 46, 49) contacts the second plurality of conductive traces (41, 42; 41, 42, 44, 45, 47, 48), characterized in that the force sensing material (43; 43, 46, 49) is resiliently deformable and has electrical characteristics varying as a function of deformation of the force sensing material (43; 43, 46, 49), the force sensing material (43; 43, 46, 49) is attached to the support area of the housing (10; 13-15) by an adhesive layer formed of an adhesive material having a bulk modulus that is greater than a bulk modulus of the force sensing material (43; 43, 46, 49), and the force sensing material (43; 43, 46, 49) has a second face abutting on the inner face of the window. a display; a window overlaid on the display, the window having an inner face facing toward the display and an outer face; a housing (10; 13-15) supporting the window; a first sensor arrangement (31, 32) configured to sense a position of a touch action on the window in two dimensions, the first sensor arrangement (31, 32) comprising a first plurality of conductive traces; and a second sensor arrangement (41-43; 41-49) configured to sense a magnitude of a force applied by the touch action onto the window, the second sensor arrangement (41-43; 41-49) comprising a second plurality of conductive traces (41, 42; 41, 42, 44, 45, 47, 48) and a force sensing material (43; 43, 46, 49), the force sensing material (43; 43, 46, 49) having a first face supported on a support area of the housing (10; 13-15), wherein the first plurality of conductive traces and the second plurality of conductive traces (41, 42; 41, 42, 44, 45, 47, 48) are positioned on the inner face of the window and attached to the inner face of the window, and wherein the force sensing material (43; 43, 46, 49) is attached to the inner face of the window such that the force sensing material (43; 43, 46, 49) contacts the second plurality of conductive traces (41, 42; 41, 42, 44, 45, 47, 48), characterized in that the force sensing material (43; 43, 46, 49) is resiliently deformable and has electrical characteristics varying as a function of deformation of the force sensing material (43; 43, 46, 49), the force sensing material (43; 43, 46, 49) is attached to the support area of the housing (10; 13-15) by an adhesive layer formed of an adhesive material having a bulk modulus that is greater than a bulk modulus of the force sensing material (43; 43, 46, 49), and the force sensing material (43; 43, 46, 49) has a second face abutting on the inner face of the window.