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To create a pie chart with three layers in R, you can follow these steps:

1. Create a data frame with the values for each layer:

layers <- data.frame(values = c(25, 35, 40))

1. Create a vector with the labels for each layer:

labels <- c("Layer 1", "Layer 2", "Layer 3")

1. Use the pie() function to create the pie chart:

pie(layers$values, labels = labels, col = c("red", "green", "blue"), main = "Three-Layer Pie Chart")

In this example, the values column in the layers data frame contains the values for each layer. The labels vector contains the labels for each layer. The col parameter specifies the colors for each layer. The main parameter adds a title to the chart.