9. Sketch a hexagonal close-packed structure. Face-centered cubic (fcc) structure has the slip plane (111) with the stacking order of ABC. The following figure shows three consecutive close-packed stacking of the slip planes (111) in the foc structure. a. Please name the three layers (1,2,3) and provide the reasons for your naming. (2 points). b. What is close-packed stacking fault?. Provide a typical condition of crystal to cause the stacking fault and write the stacking fault (4 points). A Layer Layer Layer