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Yemenite Matzos or Lafa Matzos:
The custom of a number of generations, dating to approximately the late 1700’s, is to bake thin cracker like Matzos. This is done as an extra Hiddur, to ensure the Matzah is finely and quickly baked. In previous times, however, Matzos had the same consistency as bread, and were soft and foldable. These today are known as Yemenite Matzahs, who until this very day keep to the original tradition. An Ashkenazi may not purchase such Matzahs, as in addition to it being a break of the current tradition, the Yemenites who bake these Matzos follow the rulings of the Rambam and permit many matters which for an Ashkenazi defines the Matzah as Chametz, such as Kefulos and Nefuchos, of which they are not careful.
 See Admur Shut 6; Shaareiy Teshuvah 461; Ashel Avraham Butchach 461; M”B 461:10; Piskeiy Teshuvos 461:10