WHOLE CHARACTER
片
a flat, thin piece; a card (卡片,照片); to cut into thin slices (肉片); small in amount; partial (片段,片面); a measure word for areas, scenes and feelings (一片新气象)
片 is a flat thin piece: 照片 'photo', 卡片 'card', 药片 'pill'.
Taught as one complete written unit. ZDIC: 指事,像劈开的木片 — half of a split tree-trunk.