The purpose of this paper is to justify the claim that there are foci that do not constitute syntactic constituents. I make this same claim and propose an HPSG-based theory of non-constituent focus in general in Yatabe and Hayakawa (2005), but the arguments for this claim that are presented in that paper are brief and incomplete. The present paper sets forth a more complete set of arguments.
(S. Yatabe, "Evidence for the existence of non-constituent focus," in Nihon Gengogakkai Dai-133-kai Taikai Yokoo-shuu (Proceedings of the 133rd Meeting of the Linguistic Society of Japan), Linguistics Society of Japan, Kyoto, 2006, pp. 105-110.)