ヘン, かた, かた
one-sided, leaf, sheet, right-side kata radical (no. 91)
JLPT2 G6 S4 F1076
Reverse image of 爿 long, wooden sleeping pallet, both of which show a long piece of wood split down the middle → *thin and flat piece*; *part* → *few*; *little*; *one* (of a pair/set); *one side*.
[Full Kanji Etymology List]