<p>Two slabs with square cross section of different materials (1, 2) with equal sides (l) and thickness&nbsp;<span class="equation">\(d_1\)</span>&nbsp;and&nbsp;<span class="equation">\(d_2\)</span>&nbsp;such that&nbsp;<span class="equation">\(d_2=2d_1\)</span>&nbsp;and l &gt; <span class="equation">\(d_2\)</span>. Considering lower edges of these slabs are fixed to the floor, we apply equal shearing force on the narrow faces. The angle of deformation is <span class="equation">\(\theta_2=2\theta_1\)</span>. &nbsp;If the shear moduli of material 1 is 4 X <span class="equation">\(10^9N/m^2\)</span>, then shear moduli of material 2 is x X <span class="equation">\(10^9N/m^2\)</span>, where value of​ x is_______​​​​​​</p>