In Japanese, there are certain constraints on constituent order that have to be obeyed for a sentence involving quantifier floating to be acceptable. In this paper, I show that those constraints, which have been noted and discussed by Haig, Kuroda, Miyagawa, and others, can be stated in simple thematic terms if we assume that lexical heads in Japanese are allowed to combine with their arguments and adjuncts in any order and in any configuration, thus giving rise to completely flat structure, partially flat structure, binary branching structure, structure in which the object NP asymmetrically c-commands the subject NP, etc.
(S. Yatabe, "Quantifier floating in Japanese and the θ-hierarchy," in Michael Ziolkowski, Manuela Noske, and Karen Deaton, eds., CLS 26, Volume 1: The Main Session, Chicago Linguistic Society, Chicago, 1990, pp. 437-451.)