Glazing

A glazing panel comprises in sequence at least: a glass substrate (10) a base antireflective layer (11) comprising at least a base antireflective lower layer (12) and a base antireflective upper layer (13) which is of a different composition to that of the base antireflective lower layer, the base antireflective upper layer comprising a mixed oxide of Zn and at least one additional material X, in which the ratio X/Zn in the base antireflective upper layer is between 0.02 and 0.5 by weight and in which X is one or more of the materials selected from the group comprising Sn, Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti a first infra-red reflecting layer (14) a first barrier layer (15) a central antireflective layer (16) comprising at least a central antireflective lower layer (17) and a central antireflective upper layer (18) which is of a different composition to that of the central antireflective lower layer, the central antireflective upper layer comprising a mixed oxide of Zn and at least one additional material Y, in which the ratio Y/Zn in the base antireflective upper layer is between 0.02 and 0.5 by weight and in which Y is one or more of the materials selected from the group comprising Sn,Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti a second infra-red reflecting layer (19) a second barrier layer (20) a top antireflective layer.(21) The coating stack of such a glazing panel may provide particularly advantageous levels of the thermal stability so as to facilitate heat treatment of the glazing panel.