Whenever the Commission makes a preliminary determination, the Secretary shall serve copies of the determination and a public version of the staff report on the petitioner, other parties to the investigation, and the administering authority. The Secretary shall publish a notice of such determination in the Federal Register. If the Commission's determination is negative, or that imports are negligible, the investigation shall be terminated. If the Commission's determination is affirmative, the notice shall announce commencement of the final phase of the investigation.