$Mo{S}_2$ is being researched as a semiconductor. Its space group is $P\frac{6_3}{m}mc,a=3\mathrm{.}1604,c=$

a$.$ Draw several unit cells of this crystal

b$.$ What types of bonding do you expect within layers? Between layers?

c$.$ Explain whether you believe this material will have the same electrical resistivities along $a,b,$ and $c.$