Method for fabricating an interposer is provided. The layer facilitates ease of removal of particulates that deposit on the protective layer. A second section is provided on a first side of the first section relative to the first direction. A defined adhesive gap optimal for the adhesive used is also provided. When a user intends to raise the backrest, heshe can lift the backrest with his finger passing through a semicircular hole provided on the rear portion of the backrest so that the protruding portion of the supporting rod 3 can slide to the lowest point along a slopping slot. If a directory number associated with the desired called party is not in the subscriber’s address book, a voice services node initiates a call to a directory assistance service to obtain a directory number for the called party.