…the adornments that they have to give to Zeir Anpin, these being his Mental Powers. These adornments comprise the entire Tzelem in all its parts, i.e. all the Mental Powers.
This is similar to all other cases where a higher Partzuf gives Mental Powers to a lower one. This is not specific to Zeir Anpin but applies to all the Partzufim.
Part 2: And when Abba and Imma themselves give the Mental Powers to Zeir Anpin… It is in Abba and Imma’s intrinsic nature to divide into two Partzufim through the mystery of Arich Anpin’s Kindnesses and Strengths, which are half covered and half revealed (see Opening 110). From then on either one of these two parts – either the upper part, namely Abba and Imma, or the lower part, namely Israel Sabba-Tevunah – may be the primary agent of this function of giving Zeir Anpin his Mental Powers.