1. Identify following defect / boundary type for the following materials; for metals, also identify the crystal structure where you would find the stacking sequence. Note that * represents a boundary. a. A metal with stacking sequence ABCABCABABC. b. A metal with stacking sequence ABABABCACACA. c. As shown below, CdI2 normally is made up of a layered sequence of AcBAcB..etc. where A \& B are close-packed anion layers and c is the cation layer in octahedral interstitial sites. i. AcB AcB AcB * AcB AcB ii. AcBAcBCbACbA