The method includes chemical-mechanical polishing to planarize an insulating interlayer deposited on a lower pattern. The insulating interlayer is polished using a surfactant. The chemical-mechanical polishing includes at least two separate polishing steps of different fluxes of the surfactant. The first polishing step is performed for touching up an upper side of the insulating layer. The second polishing step is performed, after completing the first polishing step, for planarizing the insulati...







