Three zones can be define across the cross-section. the cavities between the layers and the porosities within the droplets respectively. The presence of porosities in zone B, which is located in the middle of specimen (Fig. 7b), decreases significantly. In zone C (Fig. 7c), the presence of cavities or interlayer spacing is more noticeable. In contrast, the porosities are not present with in the droplets in this zone.